Abstract
A Green's function decoupling method is shown to yield quasiparticle bands for the 2D Hubbard model in excellent agreement with the Monte Carlo results of Bulut et al. The same approach gives d-wave superconductivity with Tc in the range 10–100K for a band-width of 4eV, on-site interaction U = 2eV and the Fermi level close to a van Hove singularity.
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We thank Dr. N. Bulut for communicating his results before publication.